Summary & Overview
CPT 29425: Lower Leg Cast Application for Tibia/Fibula Fracture or Severe Ankle Sprain
CPT code 29425 denotes the application of a lower leg cast to treat fractures of the tibia and fibula or severe ankle sprains, including accommodation for a cast shoe or a footplate with rubber heel to permit ambulation when appropriate. This procedure is a common orthopedic intervention in acute injury care and bears operational and reimbursement importance across emergency departments and outpatient orthopedic clinics nationwide. Key payers in scope include Aetna, Blue Cross Blue Shield, Cigna Health, United Healthcare, and Medicare. Readers will find a concise overview of the clinical context for cast application, payer coverage considerations, and related billing relationships to similar splint and cast codes. The publication provides benchmarks and coding comparisons to nearby service codes used for upper- and lower-extremity splints and casts, clarifies the typical site-of-service implications for ambulatory versus emergency care, and highlights common clinical scenarios supporting the use of this cast application. Data not available in the input is explicitly noted where applicable. The content is intended to inform coding, billing, and clinical documentation teams about the clinical definition, service setting, and payer landscape relevant to CPT code 29425.
Billing Code Overview
CPT code 29425 describes the application of a lower leg cast for treatment of a fracture of one or both bones of the lower leg (tibia and fibula) or for a severe ankle sprain. The procedure includes forming the bottom of the cast to accommodate a cast shoe that straps on over the cast to permit ambulation when the patient can bear weight, or alternatively applying a footplate and rubber heel to the bottom of the cast.
Service type: Cast application / orthopaedic immobilization
Typical site of service: Emergency department or outpatient orthopaedic clinic, with ambulation possible when weight-bearing is allowed.
Clinical & Coding Specifications
Clinical Context
A 28-year-old patient presents to the emergency department after twisting their ankle during a fall. The provider evaluates the limb, obtains plain radiographs, and diagnoses a distal tibia/fibula fracture consistent with a closed lower leg fracture. After neurovascular exam and analgesia, the provider performs closed reduction as needed and applies a short leg cast that is formed at the sole to accept a cast shoe, permitting protected ambulation once weight bearing is allowed. The workflow includes documentation of informed consent, pre‑procedure neurovascular status, materials used (casting material, padding, heel/rubber sole or footplate), time spent, and post‑application instructions (elevation, weight‑bearing status, wound care, and follow‑up with orthopaedics).
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | When the cast is applied to the left lower extremity |
RT | Right side | When the cast is applied to the right lower extremity |
59 |